SAS, the Supplementary Alerting Service app, is a free official app developed by the Department of Justice Community Safety Victoria for emergency service personnel in Victoria, Australia. The app supplements and connects to the existing Emergency Alerting System used by career and volunteer emergency service personnel across Victoria.

To access the app, users need login details provided by their agency. Once logged in, users can receive notifications of emergencies, respond to emergencies, view other responders, and chat with other agency users. The app also provides a forecast of availability.

It's important to note that the app is only supported on Android 12, Android 11, and Android 10. Supported agencies include CFA, SES, and AV (Rural).

Overall, SAS is a valuable tool for emergency service personnel in Victoria, providing a quick and efficient way to respond to emergencies and communicate with other responders.